Study of the influence of oxygen on the composition of thin films obtained by r.f. sputtering from a Ca5(PO4)3 OH target

Dijk, K. van; Verhoeven, J.; Marée, C.H.M.; Habraken, F.H.P.M.; Jansen, John A.

doi:10.1016/s0040-6090(97)00104-1

Cited by 43 publications

(36 citation statements)

References 9 publications

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“…50) The kinetic energy of argon ions could increase with increasing RF power and C O 2 at a specific RF power 49) and with decreasing total pressure. 33) The increase in kinetic energy of argon ions would cause the increase in kinetic energy for sputtering the target, and then the atoms or clusters could arrive at the substrate with higher kinetic energy accelerating the crystallization.…”

Section: Phase and Composition Of Filmsmentioning

confidence: 99%

“…It was reported that the deposition rate decreased drastically by adding 1% O 2 to the sputtering gas. 49) It is known that high energy electrons also contribute the deposition in RF magnetron sputtering. Since O 2 would catch electrons to ionize O atoms as called ''electron scavenger'', the increase in C O 2 causes the decrease in deposition rates as demonstrated in Fig.…”

Section: )mentioning

confidence: 99%

“…Radiofrequency (RF) magnetron sputtering has been used in wide areas for coatings of thin films with excellent adherence to substrates, 43) and applied to coatings of calcium phosphate films on commercially pure titanium (CP-Ti) 23,37,38,40,44) and þ type titanium alloys. 33,35,36,41,42,45,[47][48][49][50] Ti and its alloys are known as biocompatible metals because of their low elastic modulus, high corrosion resistance and the appropriate combination of strength and ductility. Low processing temperature is also an advantage of RF magnetron sputtering for calcium phosphate coatings for Ti substrates because the mechanical properties of the substrates will be degraded by high processing temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Calcium Phosphate Films by Radiofrequency Magnetron Sputtering

et al. 2005

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Calcium phosphate films were prepared on titanium substrates by radiofrequency (RF) magnetron sputtering at RF powers from 75 to 150 W. Hot-pressed -tricalcium phosphate (-TCP) plates with a high density (>99:6%) were used as a sputtering target. The substrate was not intentionally heated. The films consisted of amorphous calcium phosphate and oxyapatite (Ca 10 (PO 4 ) 6 O) phases. The ratio of the oxyapatite phase depended on the sputtering conditions of RF power, oxygen gas concentration in the sputtering gas (C O2 ) and total pressure in the chamber. The (002) preferred orientation of oxyapatite phase was observed. The deposition rate of films increased with increasing RF power and decreasing C O2 . The highest deposition rate was 0.143 nmÁs À1 (0.515 mmÁh À1 ).

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Section: Phase and Composition Of Filmsmentioning

confidence: 99%

Section: )mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation of Calcium Phosphate Films by Radiofrequency Magnetron Sputtering

et al. 2005

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“…Previous studies have shown how various aspects of the sputtering technique, such as argon gas pressure 35) , voltage 36) , presence of oxygen species 37) , and discharge power level 38) could significantly influence the calcium and phosphate concentrations. We believe that the dual sputtering deposition technique is an appropriate coating technique for controlling HA and TiO2 deposition; it can change a surface to a positive charge and also control the surface electric charge intensity on a titanium surface.…”

Section: Discussionmentioning

confidence: 99%

Enhanced biological responses of a hydroxyapatite/TiO<Sub>2</Sub> hybrid structure when surface electric charge is controlled using radiofrequency sputtering

et al. 2012

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We investigated whether surface roughness and control of surface electric charge of a hydroxyapatite (HA)/titanium oxide (TiO2) hybrid coating could enhance biological responses associated with bone formation. After acid etching, a titanium surface was modified with HA and TiO2 by the dual sputtering deposition technique using radiofrequency sputtering. These surfaces were analyzed for surface roughness and surface electric charge intensity. Rat bone marrow-derived osteoblast-like cells were cultured on HA/TiO2 hybrid surfaces with different electric charges. The attachment and spreading behavior of these cells were significantly increased on the hybrid surface (p<0.05). In vivo experiment, the strength of bone-titanium implant integration with a hybrid surface was 3 times that of a control (p<0.05). The dual sputtering deposition technique created a HA/TiO2 hybrid structure. Our results show that the surface electric charge on a titanium surface is an important factor for enhancing biological responses.

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“…Oxygen was used for a better stoichiometry of the HAP film deposited on the murine femurs. 27 Deposition parameters during sputtering were as follows: argon flow rate 140 sccm, oxygen flow rate 10 sccm, chamber pressure 6.4 · 10 -3 Torr, and input power level 140 W. HAP was deposited at a rate of 25-30 nm/h. Murine femurs were mounted at their ends by a vacuum tape to a planar steel platform 150 mm from the sputtering target; after deposition to the desired thickness, each femur was rotated about its longitudinal axis by 180°, and the entire deposition process was repeated.…”

Section: Physical Vapor Deposition Of Hapmentioning

confidence: 99%

Specific Biomimetic Hydroxyapatite Nanotopographies Enhance Osteoblastic Differentiation and Bone Graft Osteointegration

Loiselle

Wei

Faryad

et al. 2013

Tissue Engineering Part A

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Impaired healing of cortical bone grafts represents a significant clinical problem. Cadaveric bone grafts undergo extensive chemical processing to decrease the risk of disease transmission; however, these processing techniques alter the bone surface and decrease the osteogenic potential of cells at the healing site. Extensive work has been done to optimize the surface of bone grafts, and hydroxyapatite (HAP) and nanotopography both increase osteoblastic differentiation. HAP is the main mineral component of bone and can enhance osteoblastic differentiation and bone implant healing in vivo, while nanotopography can enhance osteoblastic differentiation, adhesion, and proliferation. This is the first study to test the combined effects of HAP and nanotopographies on bone graft healing. With the goal of identifying the optimized surface features to improve bone graft healing, we tested the hypothesis that HAP-based nanotopographic resurfacing of bone grafts improves integration of cortical bone grafts by enhancing osteoblastic differentiation. Here we show that osteoblastic cells cultured on processed bones coated with specific-scale (50-60 nm) HAP nanotopographies display increased osteoblastic differentiation compared to cells on uncoated bone, bones coated with poly-l-lactic acid nanotopographies, or other HAP nanotopographies. Further, bone grafts coated with 50-60-nm HAP exhibited increased formation of new bone and improved healing, with mechanical properties equivalent to live autografts. These data indicate the potential for specific HAP nanotopographies to not only increase osteoblastic differentiation but also improve bone graft incorporation, which could significantly increase patient quality of life after traumatic bone injuries or resection of an osteosarcoma.

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Study of the influence of oxygen on the composition of thin films obtained by r.f. sputtering from a Ca5(PO4)3 OH target

Cited by 43 publications

References 9 publications

Preparation of Calcium Phosphate Films by Radiofrequency Magnetron Sputtering

Preparation of Calcium Phosphate Films by Radiofrequency Magnetron Sputtering

Enhanced biological responses of a hydroxyapatite/TiO<Sub>2</Sub> hybrid structure when surface electric charge is controlled using radiofrequency sputtering

Specific Biomimetic Hydroxyapatite Nanotopographies Enhance Osteoblastic Differentiation and Bone Graft Osteointegration

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